Hydraulically-operated die-casting machine



Aug. 13, 1929. w. o. w|| ET AL HYDRAULICALLY OPERATED DIE CASTING MACHINE Filed Aug. 25, 1927 4 Sheets-Sheet lllll II II I Ill-ll mlvx;

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Aug. 13, 1929.

W. O. WILL ET AL Filed Aug. 25, 1927 4 Sheets-Sheet 5 HYDRAULICALLY OPERATED DIE CASTING MACHINE Aug. 13, 1929.

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Aug. 13, 1929. w. o. WILL ET AL HYDRAULICALLY OPERATED DIE CASTING MACHINE Filed Aug. 25, 1927 4 Sheets-Sheet 4 lbdez i-or. fiQZZerGfi ZZZ d7 Zinc Car/5027.

Patented Aug. 13, 1929.

UNITED STATES 1,724,332 PATENT OFFICE.

WALTER O. WILL AND ERIC CARLSON, OF CHICAGO, ILLINOIS, ASSIGNORS TO STEWART DIE CASTING CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELA WARE.

HYDRAULICALLY-OPERATED DIE-CASTING MACHINE.

Application filed August 25, 1927.

The purpose of this invention is to provide an improved construction of die casting machine having its moving parts manually actuated by hydrostatic pressure through suitable motive devices whose operations are controlled by timing apparatus for producing the several movements 1n correct predetermined sequence and of predetermined duration; and the present application is particularly concerned with the hy-. draulically controlled and operated means for withdrawing the cores and releasing the casting from the die members after the die is opened.

The invention consists in the elements and features of construction and their combinations shown and described as indicated in the claims.

In the drawings:

Figure 1 is a partly diagrammatic view of the nature in general of a partly sectional side elevation of an apparatus em bodying this invention, section being made at a vertical plane through the die members.

Figure 2 is a partly sectional s de elevation of the same looking in the direction of the arrow 2 on Figure 1, section being made in a vertical plane through the two dies and adjacent parts centrally with respect to the dies.

Figure 3 is a horizontal section at the line 3-3 on Figure 1.

Figure -i is a section at the line 44 on Figure 1.

Figures 5, 6. and 7 are respectively stC- tionsat the planes indicated by the lines 55. 66. and 7 7 on Figure 1.

Figure 8 is an enlargement of a portion of the section shown in Figure 1 at the middle of the left-hand side of that figure showing the valve which controls the pressure for ejecting the molten metal to the die.

Figure 9 is a diagram for showing the valve connections to the several rams which operate different parts of the mechanism.

Figure 10 is a section on an enlarged scale at the plane indicated by the line 1010 on Figure 1.

Figure 11 is a plan view of a portion of the structure shown in Figure 10.

Figure 12 is a fragmental detail view showing the core plate 35 carried by the stem 33 of the ram piston rod.

In the construction shown in the drawings,

Serial No. 215,380.

A the base frame of the machine upon which there is erected a frame structure comprising four corner uprights B, B, B, B, by means of which, and extending transversely between them, or within the area. defined by them, there are respectively posit-ioned and supported an upper die carrier plate, D, and a top plate, D which ties together the upper ends of the uprights, B, B, B, B, and serves as the upper head of the cylinder, F, of a hydraulic ram for reciprocating the upper die carrier by means of the piston member, E, of said ram, said piston member having connection including the axially hollow stem portion, E, extending downwardly and otherwise hereinafter particularly described, by which it is rigidly attached to said upper die'carrier for reciprocating the latter, and having a stem element, 152, extending upwardly by which it obtains uidance in said top plate.

Between the corner uprights there are mounted rigidly on the base frame, A, a bot tom die carrier, C; and on said base frame there is mounted also a pot, U, for molten metal, above which and adapted to be depressed into it, there is carried, suitably for dipping in the metal in the pot to become filled therewith and lifted from the pot, a metal carrier and injector, O, which is suit.- ably connected with operating parts for advancing it into registration of its discharge nozzle, 22, with the inlet nipple, 23, of the die.

As thus far described, the construction is substantially shown'and made the subject of claims in our pending application for patent, Serial No. 85,165, filed February 1, 1926, in which there is-also shown and described means for operatingby hydraulic pressure, the means f r opening and closing the die members for depressing, lifting, advancing and registering the metal carrier and injector. Said hydraulicdevices, shown conventionally in the present drawings, consist of pipe connections for conducting the hydraulic pressure elements, preferably oil or glyccrine, to and from the several operating devices, as, the ram, F, for the upper die carrier, the ram, V, for operating the metal carrier and injector, the ram, X, for controlling a valve, \V, which controls the admission and exhaust of compressed air to and from the metal carrier for injecting the metal into the die, together with valves, T, T and T operated in predetermined time relation by timing cams, R, R and R for controlling the admission and return of the pressure fluid to and from the respective rams and back to the reservoir. Said fluid is pumped for making its circuit, as indicated, by a motor-driven pump, H, whose intake is connected as indicated at g with a reservoir, G, the motor being shown at J and fluctuations in the hydrostatic pressure are reduced to a narrow margin by providing a relatively small compressed air cylinder, K, connected with a relatively large compressed air reservoir, K the latter being kept supplied by suitable pumping means, not shown, a piston, L, in the cylinder, K having a relatively small-diametered stem, L, extending for reciprocating in the correspondingly diametered cylinder, K, formed integrally with the cylinder, K, and having connection indicated at G beyond the end of the piston stem, L, with the discharge of the pump, and thereby through thepump with the reservoir, G. By this means the pneumatic pressure in the cylinder, K becomes at all times the measure of the hydrostatic pressure operative through the valve and pipe connections to the several hydraulic rams which operate the several devices.

The present application has to do with the additions to, or embodiment in, the mechanism thus far described, and which is shown in our said application, Serial No. 85,165 above mentioned, of hydrostatically and pneumatically operated means for drawing cores and expelling casting.

These features of the structure will now be described.

At each of the four sides of the frame structure as defined by the corner uprights, B, B, B, B, except the side at which the metal pot is located, there is provided a coreoperating structure. These three structures are all alike and a single description will suffice for all three, their corresponding parts being similarly marked.

On a bracket, 30, carried by the base frame, A, there is mounted the cylinder, 31, of a core-actuating ram whose piston, 32, has a stem, 33, protruding through the forward head, 34, of the cylinder, and at its forward end carries rigidly for reciprocation with the ram piston a core-carrying plate hereinafter referred to as the core plate, 35, which extends upwardly past the parting plane of the die members D and D so as to face both the upper and lower die members, said plate having distributed over its vertical face a multiplicity of aperture for securing core supports at selected positions projecting toward the die and adapted for seeurement to their ends of cores of any form which can be withdrawn from the die in direct line parallel to the slideway on which the head is mounted for sliding toward and from the die members on the upper and lower die carriers respectively. Flexible pipes, and 51, are con nected at the opposite ends of the cylinder, 31, leading thereto from the pressure reservoir, G, by-way of a valve, T operated by a timing cam, R on the cam shaft, r, rotated at predetermined speed by an electric motor or other relatively light power means represented conventionally at 60. Valves, T and T operated respectively by cams, R and B, it may be understood control rams on the other two sides of the. frame structure corresponding to the ram, 40, which is located at what may be referred to as the front end of the machine, similar constructions being located at right and left hand sides respectively for operating cores at those sides of the die. Said similar constructions are shown in Figure 2 having their several parts corresponding to the parts, 31, 32, 33, 34 and 35, indicated by numerals, 41 42", 43", 44 and 45", respcc tively, and it may be understood that the timing cams, R R and R, are formed and adjusted on the shaft, r, relative to each other and to the other cams thereon which control the other operations of the dicviz. the closing and opening of the die mem' bers D and D and the advance and re traction of the metal carrier and the injection of the molten metal into the die,to cause the inthrust and ,wit-hdrawal of the cores to occur at proper times in the proces of forming and delivering the casting.

For operating cores and cast-dislodging or knock-out devices in the lower die, there is mounted in the base frame, 7A, a ram comprising the cylinder, 70, and piston. 71. therein having a stem, 72, protruding through the head, of the cylinder, 70, and carrying rigidly above said head the core plate, 73, formed with a multiplicity of threaded holes indicated at 7-174 for receiving in selected holes suitable for the particular casting, core rods. -75, which extend upward and protrude through the knock-out plate, 85, hereinafter described. and through the lower die carrier, G, into the lower mold member on said lower die carrier. Hydraulic pressure connections with the ram cylinder, 70, are made, as seen in Figure 1, by pipes, 70 and 70, which may be traced on the diagram Figure 9, the pipe, 70, being connected by'aport, 76, leading into the upper end of the cylinder, 70, for admitting pressure above the ram piston, and the pipe, 70*, being similarly connected by a port, 77, leading into the lower end of said cylinder for admitting pressure below the piston. For operating the means for loosening the casting from the die, commonly called knock-out pins, there is provided mounted below'the core-operating ram, a ram comprising the cylinder, 79, having its upper head formed by the plate, 100, interposed between the two cylinders, and 79, and extended horizontally for support on the base frame, A, and its lower head shown at 79 rigid with the cylinder, 79. The piston, 80, of the knock-out operating ram has its stem, 81, extending up through the plate, 100, and through the stem, 72, of the piston, 71, which is axially bored to accommodgte and fit said stem, 81, which emerges above the core-operating plate, 7 3, and carries at its upper end a plate, 85, hereinafter referred to as the knock-out plate from which knock-out pins, 86, protrude upwardly through the lower die carrier, G, into the die cavity for engaging the casting to loosen it from the die. The hydraulic connections for operating the knock out ram are made by pipes indicated at 90 and 91, on Figure 1, and which may be traced on the diagram Figure 9, the pipe, 90, being connected at the upper end of the ram cylinder, 79, and the pipe, 91, being connected at the lower end of said cylinder.

The core plate, 73, is formed with a multiplicity of threaded holes for receiving in selected holes positioned suitably for the particular casting, the core rods, 75, as indicated. The knock-out plate, 85, is similarly formed with holes registering with the holes of the core plate to permit the core rods, 75, in whatever selected holes they may be positioned to extend through the knock-out plate to reach the die; and in other of the holes in the knock-out plate selected suitably in accordance with the particular casting, knock-out pins, 86, are secured for extending through the lower die carrier, C, which it will be understood has a multiplicity of holes positioned for registering with the holes of the core plate and knock-out plate so that both the core rods and the knockout pins obtain access through the lower die carrier to the lower member of the die.

The carrier for the upper die member comprises the plate, I), hereinabove referred to as the upper die carrier, and parts hereinafter described constituting what is referred to as the stem E connecting rigidly with said plate the piston member, E of the hydraulic ram for reciprocating the said upper die carrier for opening and closing the (lie, said piston, E reciprocates in the ram cylinder, F, which is mounted fixedly on the frame structure, being carried by the u rights B, B, B, B, extending up from t e base, A, and defining four corners of the upwardly extending frame structure, the cylinder, F, being formed depending from a top plate, D carried at the upper ends of said uprights, B, B, B, B. Hydraulic pressure connections to the cylinder, F, for reciproeating the upper die carrier are made as indicated at 140 through said top plate, D and as indicated at 141 through the lower head, 101*, of the cylinder, F. The stem, 102, of the piston, E extends fluid-tight through the lower head, 101*, of the cylinder, F, and at its lower end below said cylinder, F, it carries rigidly a cylinder, 120, of a ram for actuating the upper core plate, that is, a plate for operating the cores of the upper die member. The piston, 121, of the ram for operating the cores of the upper die has a stem, 122, extending out through the lower head, 123, of the cylinder, 120, and carrying at its lower end the core plate, 124, from which core rods, 125, extend downwardly through suitable apertures in the upper die carrier, D. Hydraulic pressure connections for actuating the core-operating mm are made by a pipe indicated at 156 in Figure 1 below the upper head 120 of the cylinder, 120, and by a pipe indicated at 157 on Figure 1 above the lower head, 123, of said cylinder said pipe connections may be traced on the diagram Figure 9. A plate 126 for carrying knock-out pins for the upper die is positioned between the upper die carrier and the core plate, 126, said plate, 126 being carried by a stem, 130, which extends upwardly through the stem, 122, of the piston, 121, on-

up through the head of the cylinder, 120, and axially through the lower stem, 152, of the piston, E, thence up through the upper ste n, 152, which stem protrudes through the top plate, 103, and carries at its upper end the cylinder, 151, of a ram for operating said knock-out plate, said stem, 130, being extended into said cylinder, 151, and carrying therein the piston, 150. Hydraulic pressure connections to the ram cylinder, 151, are made by a pipe indicated at 159 in Figure 1 through the upper head of said cylinder, and by a pipe indicated at 160 through the lower head thereof said pipes may be traced on the diagram Figure 9. It will be understood from Figures 3 and 4 that the core plate, 126, and the knock-out plate have each a multiplicity of holes registering respectively, those of one plate with those of the other plate, and that in certain selected holes of the core plate, core rods will be secured, and in selected holes ;of the knock-out plate, knock-out pins will be secured, the holes for core rods and knock-out pins being selected suitablly for the particular form of the die so that the holes in the knock-out plate not utilized for knock-out pins may serve for accommodating the core rods 125 which must extend through the knock-out plate to reach the die.

In order that the time allowed for the metal to set in the die before the die is opened or the metal carrier is withdrawn from registration with the die. may be variable according to the size and character of the casting, provision is made for interrupting and halting all operations of the machine at the point in the cam cycle of its operation at which the injection of the metal into the die has been completed under the control of the cam, R as above described, such interruption being effected by automatic disconnection of the cam shaft, '1', from the driving power at the point in the cam cycle at which the valve, \V, is opened for admitting compressed air to the metal carrier for injecting the metal into the die, the requirement being that the pressure shall be maintained on the metal not only until the die space is filled, but thereafter until the metal becomes sufficiently set so that there can be no back flow through the inlet orifice at which the metal carrier is registered with the die. Upon the operation being halted at this stage the operator allowing time according to his judgment in view of the size and character of the casting for the metal to set, will re-start the cam shaft and the operation will be resumed and continued through the remainder of the cam cycle covering the withdrawal of the cores, the opening of the die, and the action of the knockout device for loosening the casing which will then be removed by means, not shown, suitable to its size and character.

The construction for interrupting and restarting the cam shaft for the operation indicated will now be described.

The cam shaft, 1', is aligned with its immediately antecedent driving shaft, 110 (see Figure 10), which is driven at slow speed by a worm, 111, on a -motor-driven shaft, 112, meshing with a worm gear, 113, on the shaft, 110. Said shaft,.110, carries rigidly with it at the end which abuts the end of the cam shaft, 1', a clutch sleeve, 114, mated as to cooperating clutch teeth, 114*, with a clutch sleeve, 115, mounted slidingly on the cam shaft, 1', engaged therewith fonrotation as indicated by the spline and groove shown at 116. The sleeve, 115, is counterbored from the end having the clutch teeth, 115, nearly to the opposite end, and a stop collar, 117, fast on the cam shaft, 1', occupiesthe counterbore at the outer end portion thereof for stopping at that end a coil spring 118, whose opposite end is stopped at the shoul der formed by the counterbore. From this description it will be understood that the clutch sleeve, 115, is held normally at retracted position, as shown in Figure 10, and is stopped at this position against the cam shaft 'ournal bearing, 120, and at this posir tion t e two clutch sleeves are disengaged and the cam shaft is thereby disconnected from the driving power and stands at rest. For controlling the engagement and disengagement of the two clutch sleeves, there is provided mounted fixedly on the frame structure, as by being bracketed against the standard, 121, which carries the journal bearing, 120, a sleeve, 122*, which encompasses the clutch sleeve, 115, so that the latter slides within the former. This sleeve, 122, hereinafter referred to as the cam sleeve, has at its forward end two recesses or notches, 125 and 126, which may be formed, as shown, with one edge, 127, parallel to the axis of the shaft, and the opposite edge, 128, sloping at a practicable angle for caming the sleeve, 115, against the reaction of the spring, 118, but which, as hereinafter explained, is not necessarily sloped, and on the contrary can be parallel with the opposite edge, 127, of the notch. Mounted in the sleeve, 115, near the clutch end there is an abutment, 130, which is preferably in the form of a stud and roll, as illustrated, dimensioned for entering the notches, 125- 126. As illustrated, and as usually convenient, the two notches, 125 and 126 are diametrically opposite which is in most instances possible because the first interruption of the rotation of the cam shaft,-after the metal has been injected into the mold,is timed to occur at the half-way point in the full cam cycle, and the final stop being of course at the end of the cycle, the two notches are normally angularly separated 180 degrees. In view of this most usual normal relation of the two stopping points, there may be provided, and the drawings show, two diametrically opposite stud and roll abutments, 130, carried by the clutch sleeve, 115. Considering the construction as thus far described it may be understood that normally the cam shaft is out of engagement with its immediately antecedent driving shaft and that any means being provided for sliding the clutch sleeve, 115, into clutch engagement with the clutch sleeve, 114, on the driving shaft, 110, the cam shaft will be driven with the speed of the said immediately antecedent shaft, 110; and it will be seen that upon the cam shaft commencing to rotate and carrying the abutments, 130, past the notches, 125126, so that said abutments stand against and rotate along the edge of the sleeve, 122, that sleeve being longitudinally fixed with respect to the shaft, the clutch sleeves will be held in engagement, and the cam shaft will continue to be rotated until the stud and roll abutments, 130*, again reach the notches, 125-126; that is to say, for half a revolution, whereupon the spring, 118, reacting upon the sliding clutch sleeve, 115, will disengage it from the driving clutch, and the cam shaft will come to rest not only because it is being driven very slowly and doing heavy work so its momentum is negligible, but also because the abutments, 130, being engaged with the notches, 125126, tend to lock it positively against rotation, and do look it thus positively except to the extent that. the slope of the sloping sides of the notches, if they are thus sloped as it is indicated they may be, might permit some slightly continued movement while the abutments would climb a little distance along the slopes. But the slow movement of the cam shaft and the heavy work which it is doing in fact renders its inertia too slight to interfere with the absolute and instantaneous arresting of its rotation upon the disengagement of the clutches and particularly upon the engagement of the abutments. 130, in the notches of the sleeve, 122. For operating the clutch sleeve, 115, for engagement with the driving clutch, 114, there is provided a manually operated lever, 135, fulcrumed on the frame structure at 136 and preferably formed to stride or embrace the sleeve, 122. and lodge its fork arms respectively against the stud and roll abutment, 130. at the diametrically opposite positions indicated. This lever may be mounted for movement with equal free- (10m in either direction so that it will be swung to the left,referring to the view shown in Figure 11,bv the reaction of the spring, 118, thrusting the clutch sleeve. 11,"), out of engagement with the clutch sleeve, 114, and the operator starts the cam shaft for initiating the operation of the machine by swinging the lever handle to the right, thereby carrying the ahutments. 130, out of the notches, 125"126, and carrying the clutch, 115, into engagement with the clutch, 114. the operator holding the lever in clutchengaging position for a suflicient length of time to permit the abutments, 130, to be carried away from the mouths of the notches, and become engaged against the unnotched portion of the end of the sleeve. 122, by which the clutches will be held in engagement until the abutments again arrive at the notches, 125-126. This arrival will occur as indicated at the point at which the operation of the machine should be arrested to -permit the metal to set in the die, and when in the operators judgment the delay has sufficed for this purpose, he will move the lever to the right for disengaging the stud and roll abutments from the notches of the sleeve, 122, and engaging the clutch sleeves with each other; and the machine will thereupon resume its action and complete the cycle, at the end of which the abutments, 130., will again arrive at the notches, 125- 126, and be retracted thereint-o by the spring. 118, disengaging the clutch members and bringing the machine to rest with the die open and the casting loosened therefrom ready to be removed in the manner and by the means provided according to the character of the casting.

\Ve claim:

1. In a die casting machine in combination with die members mounted for movement of one of them for opening and closing the die; core-carrying means associated with the die members respectively for i thrust and withdrawal of cores; hydraulic pressure means for actuating the moving die members for opening and closing the die; hydraulic pressure means for actuating the core-carrying members; valve means for controlling the access of hydraulic pressure to said hydraulic pressure means res 'iectively, and timing cams having their cycles of movement concurrent for controlling said valve mean respectively whereby the actuation of the cores for inthrust and withdrawal is ctl'ccted in time relation to the opening and closing of the die predetermined by the form of the calm.

2. In a die casting machine in combination with (lie member one of which is mounted movably for opening and closing the die; knock-out means for loosening the casting from the die; hydraulic pressure means for actuating the moving member of the die for opening and closing: hydraulic pressure means for actuating the knock-out device for loosening the casting; valves controlling the access of hydraulic pressure to said hv draulic pressure means respectively. arid timing cams having their cycles of movement concurrent for controlling said valves respectively, whereby the order of sequence. intervals and duration of the respective movements of the die member and the knock-out devices are predetermined by the relative formation of said cams.

3. In a die casting machine in combination with die members. one of which is movable for opening and closing the die: corecarrying members mounted for movement for inthrustand withdrawal of the cores: knock-out devices mounted for movement for loosening the casting from the die; hydraulic pressure means for actuating said movable die members; core-carrying means and knock-out means respectively; valve means controlling access of hydraulic pressure to said hydraulic pressure means respectively. and timing cams having concurrent cycles for controlling said valves respectively whereby the order of sequence. intervals and duration of said movements of the several parts is predetermined by the relative formation of said cams.

4. In a die casting machine in combination with die members. one of which is movable .for opening and closing the die: a metal carrier and injector mounted for movement for registration with and disengagement from the die: pneumatic means for injecting metal from the metal carrier into the die; core-carrying means associated with the die members re pectively for in-thrust and withdrawal of cores: hydraulic pressure means for actuating the movable member of the die for opening and closing; hydraulic pre sure means for actuating the core-carrying means for inthrust and withdrawal of cores for actuating the metal carrier for registration and withdrawal ,from the die, and, for applying and releasing pneumatic pressure for injecting the molten metal into the die; valve devices for controlling the access of hydraulic pressure to said hydraulic pressure means respectively, and timing cams having their cycles of movement concurrent for controlling said valves respectively, whereby the order of sequence, intervals and duration of the several movements of the elements specified are predetermined by the relative forms of said cams.

In a die casting machine in combination with die members, one of which is movable for opening and closing the die; a metal carrier mounted for movement for registration with and'withdrawal from the die; knock-out means for loosening the casting from the die; hydraulic pressure means for actuating respectively the movable member of the die for opening and closing, the metal carrier for registration and withdrawal from the die, and the knock-out means for loosening the casting from the die; valve means for controlling access of hydraulic pressure to said hydraulic pressure means respectively, and timing cams having their cycles of movement concurrent for controllin; said valves respectively; whereby the Order of sequence, intervals and duration of said movements of the respective parts are predetermined by the relative configuration of the cams respectively.

6. In a die casting machine in combination with die members, one of which is'movable for opening and closing the die; a corecarrying member associated with the movable die member for inthrust and withdrawal of cores; hydraulic rams for operating respectively the moving member of the die and the core-carrying member, the cylinder of the ram for operating the core-carrying member being connected rigidly for movement with the piston of the die-member-actuating ram.

7. In a die casting machine in combina tion with die members, one of which is movable for opening and closing the die; knockout devices associated with the movable die member for loosening the casting therefrom; hydraulic rams for actuating the movable die member and said knock-out devices, the cylinder of the ram for actuating the knockout devices being connected rigidly for movement with the piston of the movable diemember-actuating ram.

8. In a die casting machine in combination with die members, one of which is movable for opening and closing the die; a corecarrying member associated with the movable die member for inthrust and withdrawal of cores; a knock-out device associated with said movable die member and movable relative thereto for loosening the casting 'from said die member; hydraulic rams having their pistons connected for actuating the moving member of the die, the core-carry ing member and the knock-out device respectively, the cylinders of the rams for actuating the core-carrying member and the knockout-device respectively being each connected positively for movement with; the piston of the movable die-member-actuating ram.

9. In a die casting machine in combination with die members, one of which is movable for opening and closing the die; a carrier for molten metal mounted for registration with and withdrawal from the die, means for injecting molten metal from the carrier into the die; core-carrying members associated with the dies respectively for inthrust and withdrawal of cores; hydraulic pressure means for actuating the movable die member, the molten metal carrier and the injecting means respectively; valve means controlling the access of hydraulic pressure to said hydraulic pressure means respectively, and timing cams having concurrent cycles for controlling said valves respectively, whereby the order of sequence, intervals and duration of several movements of said parts respectively is predetermined by the relative forms of the cams; driving means for said cams; automatic means for arresting the driving means after the injection of the molten metal into the die; means operable at will for re-starting the cam-drivingmeans; and automatic means for arresting the camdriving-means after the opening of the die.

10. In a die casting machine in combination with a die member having intersecting cores; hydraulic rams actuating the core members respectively; and timing cams controlling the action of said rams for inthrust and withdrawal of the intersecting cores respectively, said cams being formed and adjusted relatively to each other to actuate the intersecting cams in predetermined order in accordance with their construction for intersecting each other.

In testimony whereof, we have hereunto set our hands at Chicago, Illinois, this 8th day of August, 1927.

V WALTER O. WILL.

ERIC C-ARLSON. 

